American women have gotten fatter as it has become more socially acceptable to carry a few extra pounds, according to a new study.
Florida State University Assistant Professor of Economics Frank Heiland and Federal Reserve Bank of Boston Economist Mary Burke are the co-authors of a paper published in the academic journal Economic Inquiry that argues that the ballooning weight of the population has fed even more collective weight gain as our perception of what is considered a normal body size has changed.
“This is a social force that we are trying to document because the rise in obesity has occurred so rapidly over the past 30 years,” said Heiland, who also is affiliated with FSU’s Center for Demography and Population Health. “Medically speaking, most agree that this trend is a dangerous one because of its connection to diabetes, cancer and other diseases. But psychologically, it may provide relief to know that you are not the only one packing on the pounds.”
The paper, “Social Dynamics of Obesity,” is the first to provide a mathematical model of the impact of economic, biological and social factors on aggregate body weight distribution. It also is one of the first studies to suggest that weight norms may change and are not set standards based on beauty or medical ideals.
Many economists believe that people eat more -- and thus gain weight -- when food prices drop, but that’s just part of the story behind the nation’s dramatic weight gain since the late 1970s, according to the researchers. The full price of a calorie has dropped by about 36 percent relative to the price of consumer goods since 1977, but prices leveled off in the mid-1990s. And yet American women continued to get bigger.
Heiland and Burke’s “social multiplier” theory offers a potential reason why: As Americans continue to super-size their value meals, the average weight of the population increases and people slowly adjust their perceptions of appropriate body weight. Given that these changes in perception may come about gradually, Heiland and Burke suggest the nation’s battle of the bulge may extend into the future.
Heiland and Burke studied body weights among American women in the 30- to 60-year-old age bracket from 1976 to 2000. Using data from the National Health and Nutrition Examination Survey, they found that the weight of the average woman increased by 20 pounds, or 13.5 percent, during that period. There was disproportionate growth among the most obese women as the 99th percentile weight increased a hefty 18.2 percent, from 258 to 305 pounds.
The researchers also looked at self-reports of women’s real weights and desired weights. In 1994, the average woman said she weighed 147 pounds but wanted to weigh 132 pounds. By 2002, the average woman weighed 153 pounds but wanted the scales to register 135 pounds, according to data from the Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance System.
The fact that even the desired weight of women has increased suggests there is less social pressure to lose weight, Heiland said, citing a previous study that 87 percent of Americans, including 48 percent of obese Americans, believe that their body weight falls in the “socially acceptable” range.
While it seems thinness is increasingly idealized in popular culture -- images of waif-like models and stick-thin celebrities are everywhere -- there is a gap between the cultural imagery and the weights that most people consider acceptable for themselves and others, according to Heiland.
Biological forces also play a role in the rise of obesity. An additional pound of body weight is more likely to be fat, which does not metabolize calories nearly as well as muscle tissue, Heiland explained. Therefore, any increase in calorie consumption -- say, one more cookie each day -- leads to greater weight gain among an initially heavier person.
The researchers focused this study on women partly because their weight gains have been so dramatic, Heiland said, citing a whopper of a statistic: 33.2 percent of American women over age 20 are classified as obese, according to 2001-2004 National Health and Nutrition Examination Survey data. However, men also have become heavier, and the researchers believe the same economic, social and biological forces are to blame.
Frank Heiland | EurekAlert!
The Great Unknown: Risk-Taking Behavior in Adolescents
19.01.2017 | Max-Planck-Institut für Bildungsforschung
A sudden drop in outdoor temperature increases the risk of respiratory infections
11.01.2017 | University of Gothenburg
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences